I know the meaning: If you want to explore the three thousand realms of the earth, you must go to the peak of eight hundred mountains. (It means: Only by standing high can you see far.) A sparrow does not know how high the heaven and earth are, and a well does not know the rivers and seas. The vastness of the world. (Meaning: It means that if you cannot broaden your horizons, you will not be able to understand the vast world.) Water has a source, so its flow is endless; trees have roots, so its growth is endless. (Meaning: Everything has a starting point. When looking at a problem, we must go to the root and seek out the source in order to grasp the essence.) People have their own metabolism, and the comings and goings become the past and the present. (It means: things in the world are in constant development and change, we must use a developmental perspective to view the changes in personnel and history. The evolution of .) A sage will make a mistake if he thinks ahead; a fool will gain something if he thinks ahead. (It means: when a smart person thinks about a problem, there may be some omissions; when a stupid person thinks about a problem, there may be some merits. Department.) He who knows others is wise, and he who knows himself is wise. (Meaning: A truly smart person should be able to correctly understand others as well as himself.)